Textile effluentcontains dyes of different ionic charges; therefore, it is most important to identify the efficiency of bioadsorbent with respect to their ionic charges and the mechanism of adsorption to ensure the maximum treatment. Thus, this research mainly focuses on adsorption of dyes with different net charges using three types of bioadsorbents, namely chitosan, activated carbon, and chitosan–activated carbon composites. Chitosan was extracted from the crab shells and activated carbon was synthesized from Luffa sponge. Composites of magnetic chitosan and activated carbon were also prepared from the known methods. For adsorption studies, three dyes, Basic Red 18, Acid Yellow 17, and Disperse Blue 106 were selected with positive, negative, and neutral charges, respectively. Results showed that negative dye was maximum adsorbed by chitosan at optimized conditions, while positive and dispersed dye adsorptions were significantly less, whereas adsorption of negative dye was maximum when activated carbon used at optimized parameters; but the rate of adsorption of negative and dispersed dye was considerably less. When composites used, all the dyes were adsorbed at maximum at low concentrations compared to chitosan and activated carbon. Therefore, this research infers that magnetic chitosan–activated carbon composites can be used as a promising low-cost bioadsorbent for textile effluent that contains dyes with different charges in one step.
Impact Factor
2022: 6.012
This work is licensed under a